Scarifier tooth



INVENTOR CE. Qilerf mad ATTORNEYS Sept. 25, 1928.

c. E. GILBERT SCARIFIER TOOTH Filed Nov. 8, 1924 k H WW Patented Sept. 25, 1928.

CLARENCE E. GILBERT, or" Aimmmniv, sourHnAKorA.

scanning- 11 Application filed November 8, Serial rim-4 ,659}

My invention relates to improvements in scarifier teeth and more particularly to that type of scarifier tooth which is intended for replacement and for regrinding when run down.

An object of my invention is to provide a scarifier tooth of the type described which is so constructed as to permit the reversing of the tooth in its shank, thereby presenting in a fresh point which may be used until worn down.

A further object of my invention is to provide a scarifier tooth of the type described which is so constructed as to compel its proper placement in position in its shank for efiicient operation. I

A further object of my invention is toprovide a scarifier tooth of the type described which is extremely light in weight, yet which is sufficiently rigid to withstand all of the strain to which it may be subjected.

' A further object of my invention is to 'pro vide a scarifier tooth of the type described which isof peculiar structure and which has 2 a shank with a receptacle conforming in con-' tour to the contour of the tooth, thereby preventing introduction by an unauthorized manufacturer of makeshift teeth which would impair the successful operation of the scarifier upon which the teeth are used.

A further object of my invention is to provide a scarifier tooth of the type described that is simple in construction, that may be manufactured cheaply, and that is thorough- 1y practical commercially.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claim.

My'invention is illustrated in the accompanying drawings forming part of this application, in which Figure 1 is a side elevation'of an embodiment of my invention with a part of the shank in section, and

, Figure 2 1s a sectional view along the line 2-2 of Figure 1. y

In carrying out my invention, 1 make use of a shank 1 havin a tapering aperture 2 w therethrough which is substantially X-shaped in cross section (see Figure 2). The axis of the aperture 2 is disposed at a predetermined angle from the body of the shank 1 and is approximately 120 degrees therefrom for ordinary use.

by forming a tooth havingparallel walls. The body portion is provided with ribs 4. and

thereof may be readily understood. My imtends through the opposite side'of the aper- 'which would not perform efficiently since the My improved scarifier tooth, (as reference" to Figure 2 will show) consists of a hardened steel body'portion 3 having integral vertically and horizontally extending ribs, there-' 5 'having'parallel walls extending substantially at right angles with the walls of the body portion. The outer edges of the walls of one of the ribs are tapered vfrom'a point at one side of the center portion of the tooth to one end 6, and the wallsof the other rib are tapered'from a point on the opposite side i of the center of the tooth. to the other-end 6, whereby cutting edges are formed.

The sidewalls 7 of the X-shaped body member extend to the edges 6. Openings 8 i are provided through the body member 3 adjacent each end thereof, through which a locking bolt9 is projected when eitherof the openings 8 is in registration with the aligned openings 10 in opposite side walls of the aperture portionof the shank 1. The purpose of the bolt 9 is to prevent dislodgment of the tooth from the shank and to facilitate removal of the tooth by removal of p 7 the bolt. v 1 I From the foregoing description of the various parts of the device, the operation proved scarifier tooth is disposed in theposition shown in Figure 1, and after long and continued use, let us assume that the edge is worn down tothe dotted line 11 (see Figure 1). .VVhen the edge has been worn to this condition, the entire tooth is removed from the shank 1 by withdrawal of the bolt 9' and the tooth is replaced withthe tapered sur-- face 4,- at the bottom. Thus the tooth edge formed by actual wear is inthe' proper po 9 sition for use. After the edge has been worn downagain,the tooth is removed and reversed, so that that edge 6 which at the'presout time hasbeen elevated and which eX- ture 2 is in position for engagement with the road or othersurface to be worked.

One of the most important features of my im )roved scarifier tooth is that utmost rigidity is obtained with minimum weight, and that-the tooth is at all timesheld in the proper position for use; b r

t is impossible for an unauthorizedpen son to insert make-shift teeth in the shank 1 tooth must be constructed by special manufacturing'and must conform with the contour of the aperture in the shank 1.

I claim: p 7

A scarifier tooth comprising a. body provided with parallel walls and ribs provided with parallel walls extending substantially at rig t angles therefrom, the outer 'walls of one of said ribs being tapered'from a. point at one side of the central portion of the tooth "1o the horizontal ribs being extended from one end of the tooth to the other.

" CLARENCE E. GILBERT. 

